Populate Text Field Based on Select Choice
HTML
<select>
<option>Choose a Car!</option>
<option value="car #1">Ford</option>
<option value="car #2">Volvo</option>
</select>
<input id="price" type="text" value="" />
JavaScript
var pricelist = {
'Ford': '35,000.99',
'Volvo': '68,976.99'
};
$('select').change(function() {
$("#price").val(pricelist[$('option:selected', this).text()]);
});